Shaft details

Diameter :          14½ ft (4.4 m)

Alignment :        NE-SW

Separation :        95 yd (87 m)

Depth :

• North 
• 1877:      520 yd (475 m)
• 1955:      590 yd (539 m)
• South  
• 1879:      512 yd (468 m)
• 1922:      903 yd (826 m)

Construction :

• North 
• 18 yd (16.5 m):   @ 18in (46cm) brickwork
• 117 yd (107 m):   @ cast iron tubbing
• remainder:        @ 9in (23cm) red brick
• South 
• ?18 yd (16.5 m):   @ 18in (46cm) brickwork
• ?117 yd (107 m):   @ cast iron tubbing
• remainder:        @ 9in (23cm) red brick

Running-on level :  (above Ordnance Datum)

• North (1950)
• top deck:      521 ft (159 m)
• bottom deck:   514 ft (157 m)
• South (1950)
• top deck:      521 ft (159 m)
• middle deck:   514 ft (157 m)
• bottom deck:   507 ft (154 m)

Shaft cables

• Power:           3,300 Volt,  3 phase
•                    3 core, double wire armoured 
• Signal:           intrinsically-safe low voltage
•                    multi-core, double wire armoured 
• Telephone:     intrinsically-safe low voltage
•                    multi-core, double wire armoured 
• Telemetry:     intrinsically-safe low voltage
•                      multi-core, double wire armoured 
• Monitoring:  methane drainage / ventilation quality
•                   mult-core tube bundle, rubber  armoured

Shaft pipes

• rising pump main
• fresh water main
• methane extraction
• shaft leakage drain

Sources: